What Is the PH of a Buffer System Made by Dissolving

question 5

Multiple Choice

What is the pH of a buffer system made by dissolving 10.70 grams of NH₄Cl and 20.00 mL of 12.0 M NH₃ in enough water to make 1.000 L of solution? K_b = 1.8 × 10^-5 for NH₃.

• A)9.18
• B)9.26
• C)9.34
• D)11.03

---

Definitions:

Cohort Effects

Phenomena where observed differences are due to the subjects' demographic positioning, particularly their year or era of birth, rather than actual differences in individuals.

Behaviorist Theorists

Psychologists who advocate for behaviorism, emphasizing the importance of observable actions and external stimuli in studying human and animal behavior.

Exogenous Factors

External influences that impact behavior or development, originating from outside the organism.

Validity

Refers to the degree to which a test or instrument measures what it claims to measure.